Index: sys/fs/fuse/fuse_internal.c
===================================================================
--- sys/fs/fuse/fuse_internal.c
+++ sys/fs/fuse/fuse_internal.c
@@ -242,6 +242,14 @@
 	vp_cache_at->va_mtime.tv_nsec = attr->mtimensec;
 	vp_cache_at->va_ctime.tv_sec  = attr->ctime;
 	vp_cache_at->va_ctime.tv_nsec = attr->ctimensec;
+	if (fuse_libabi_geq(data, 7, 9)) {
+		vp_cache_at->va_birthtime.tv_sec  = attr->crtime;
+		vp_cache_at->va_birthtime.tv_nsec = attr->crtimensec;
+	} else {
+		/* {-1, 0} means "no value" */
+		vp_cache_at->va_birthtime.tv_sec  = -1;
+		vp_cache_at->va_birthtime.tv_nsec = 0;
+	}
 	if (fuse_libabi_geq(data, 7, 9) && attr->blksize > 0)
 		vp_cache_at->va_blocksize = attr->blksize;
 	else
@@ -855,7 +863,10 @@
 	data = fuse_get_mpdata(mp);
 	dataflags = data->dataflags;
 
-	fdisp_init(&fdi, sizeof(*fsai));
+	if (fuse_libabi_geq(data, 7, 9))
+		fdisp_init(&fdi, sizeof(*fsai));
+	else
+		fdisp_init(&fdi, FUSE_COMPAT_SETATTR_IN_SIZE);
 	fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
 	if (!cred) {
 		fdi.finh->uid = 0;
@@ -901,6 +912,12 @@
 		fsai->valid |= FATTR_MTIME;
 		if (vap->va_vaflags & VA_UTIMES_NULL)
 			fsai->valid |= FATTR_MTIME_NOW;
+	}
+	if (fuse_libabi_geq(data, 7, 9) && vap->va_birthtime.tv_sec != VNOVAL) {
+		fsai->crtime = vap->va_birthtime.tv_sec;
+		fsai->crtimensec = vap->va_birthtime.tv_nsec;
+		fsai->valid |= FATTR_CRTIME;
+		/* birthtime can never be set to UTIME_NOW */
 	}
 	if (vap->va_mode != (mode_t)VNOVAL) {
 		fsai->mode = vap->va_mode & ALLPERMS;
Index: sys/fs/fuse/fuse_kernel.h
===================================================================
--- sys/fs/fuse/fuse_kernel.h
+++ sys/fs/fuse/fuse_kernel.h
@@ -45,6 +45,9 @@
  *  - add lock_owner field to fuse_setattr_in, fuse_read_in and fuse_write_in
  *  - add blksize field to fuse_attr
  *  - add file flags field to fuse_read_in and fuse_write_in
+#if defined(__FreeBSD__)
+ *  - add birthtime field fo fuse_attr (FreeBSD only)
+#endif
  */
 
 #ifndef _FUSE_FUSE_KERNEL_H
@@ -85,14 +88,27 @@
 	__u64	atime;
 	__u64	mtime;
 	__u64	ctime;
+#ifdef __APPLE__
+	__u64	crtime;
+#endif
 	__u32	atimensec;
 	__u32	mtimensec;
 	__u32	ctimensec;
+#ifdef __APPLE__
+	__u32	crtimensec;
+#endif
 	__u32	mode;
 	__u32	nlink;
 	__u32	uid;
 	__u32	gid;
 	__u32	rdev;
+#if defined(__APPLE__) || defined(__FreeBSD__)
+	__u32	flags;	/* file flags; see chflags(2) */
+#endif
+#ifdef __FreeBSD__
+	__u64	crtime;
+	__u32	crtimensec;
+#endif
 	__u32	blksize;
 	__u32	padding;
 };
@@ -130,6 +146,16 @@
 #define FATTR_ATIME_NOW	(1 << 7)
 #define FATTR_MTIME_NOW	(1 << 8)
 #define FATTR_LOCKOWNER	(1 << 9)
+#if defined(__APPLE__) || defined(__FreeBSD__)
+#define FATTR_CRTIME	(1 << 28)
+#endif /* defined(__APPLE__) || defined(__FreeBSD__) */
+#ifdef __APPLE__
+#define FATTR_CHGTIME	(1 << 29)
+#define FATTR_BKUPTIME	(1 << 30)
+#endif /* __APPLE__ */
+#if defined(__APPLE__) || defined(__FreeBSD__)
+#define FATTR_FLAGS	(1 << 31)
+#endif /* defined(__APPLE__) || defined(__FreeBSD__) */
 
 /**
  * Flags returned by the OPEN request
@@ -223,7 +249,11 @@
 /* The read buffer is required to be at least 8k, but may be much larger */
 #define FUSE_MIN_READ_BUFFER 8192
 
-#define FUSE_COMPAT_ENTRY_OUT_SIZE 120
+#ifdef __APPLE__
+#  define FUSE_COMPAT_ENTRY_OUT_SIZE 136
+#else
+#  define FUSE_COMPAT_ENTRY_OUT_SIZE 120
+#endif
 
 struct fuse_entry_out {
 	__u64	nodeid;		/* Inode ID */
@@ -246,7 +276,11 @@
 	__u64	fh;
 };
 
-#define FUSE_COMPAT_ATTR_OUT_SIZE 96
+#ifdef __APPLE__
+#  define FUSE_COMPAT_ATTR_OUT_SIZE 112
+#else
+#  define FUSE_COMPAT_ATTR_OUT_SIZE 96
+#endif
 
 struct fuse_attr_out {
 	__u64	attr_valid;	/* Cache timeout for the attributes */
@@ -273,6 +307,9 @@
 	__u64	oldnodeid;
 };
 
+/* size of fuse_setattr_in before the addition of crtime and flags in 7.9 */
+#define FUSE_COMPAT_SETATTR_IN_SIZE 88
+
 struct fuse_setattr_in {
 	__u32	valid;
 	__u32	padding;
@@ -290,6 +327,21 @@
 	__u32	uid;
 	__u32	gid;
 	__u32	unused5;
+#ifdef __APPLE__
+	__u64	bkuptime;
+	__u64	chgtime;
+#endif /* __APPLE__ */
+#if defined(__APPLE__) || defined(__FreeBSD__)
+	__u64	crtime;
+#endif /* defined(__APPLE__) || defined(__FreeBSD__) */
+#ifdef __APPLE__
+	__u32	bkuptimensec;
+	__u32	chgtimensec;
+#endif /* __APPLE__ */
+#if defined(__APPLE__) || defined(__FreeBSD__)
+	__u32	crtimensec;
+	__u32	flags; /* file flags; see chflags(2) */
+#endif /* defined(__APPLE__) || defined(__FreeBSD__) */
 };
 
 struct fuse_open_in {
Index: sys/fs/fuse/fuse_vnops.c
===================================================================
--- sys/fs/fuse/fuse_vnops.c
+++ sys/fs/fuse/fuse_vnops.c
@@ -1700,7 +1700,9 @@
 		}
 		/* Don't set accmode.  Permission to trunc is checked upstack */
 	}
-	if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
+	if (vap->va_atime.tv_sec != VNOVAL ||
+	    vap->va_mtime.tv_sec != VNOVAL ||
+	    vap->va_birthtime.tv_sec != VNOVAL) {
 		if (vap->va_vaflags & VA_UTIMES_NULL)
 			accmode |= VWRITE;
 		else
Index: tests/sys/fs/fusefs/getattr.cc
===================================================================
--- tests/sys/fs/fusefs/getattr.cc
+++ tests/sys/fs/fusefs/getattr.cc
@@ -212,6 +212,8 @@
 		out.body.attr.attr.uid = 10;
 		out.body.attr.attr.gid = 11;
 		out.body.attr.attr.rdev = 12;
+		out.body.attr.attr.crtime = 13;
+		out.body.attr.attr.crtimensec = 14;
 		out.body.attr.attr.blksize = 12345;
 	})));
 
@@ -228,16 +230,11 @@
 	EXPECT_EQ(10ul, sb.st_uid);
 	EXPECT_EQ(11ul, sb.st_gid);
 	EXPECT_EQ(12ul, sb.st_rdev);
+	EXPECT_EQ(13, sb.st_birthtim.tv_sec);
+	EXPECT_EQ(14, sb.st_birthtim.tv_nsec);
 	EXPECT_EQ((blksize_t)12345, sb.st_blksize);
 	EXPECT_EQ(ino, sb.st_ino);
 	EXPECT_EQ(S_IFREG | 0644, sb.st_mode);
-
-	//st_birthtim and st_flags are not supported by protocol 7.8.  They're
-	//only supported as OS-specific extensions to OSX.
-	//EXPECT_EQ(, sb.st_birthtim);
-	//EXPECT_EQ(, sb.st_flags);
-	
-	//FUSE can't set st_blksize until protocol 7.9
 }
 
 TEST_F(Getattr_7_8, ok)
@@ -292,9 +289,9 @@
 	EXPECT_EQ(10ul, sb.st_uid);
 	EXPECT_EQ(11ul, sb.st_gid);
 	EXPECT_EQ(12ul, sb.st_rdev);
+	/* fusefs should leave birthtime uninitialized */
+	EXPECT_EQ(-1, sb.st_birthtim.tv_sec);
+	EXPECT_EQ(0, sb.st_birthtim.tv_nsec);
 	EXPECT_EQ(ino, sb.st_ino);
 	EXPECT_EQ(S_IFREG | 0644, sb.st_mode);
-
-	//st_birthtim and st_flags are not supported by protocol 7.8.  They're
-	//only supported as OS-specific extensions to OSX.
 }
Index: tests/sys/fs/fusefs/mockfs.cc
===================================================================
--- tests/sys/fs/fusefs/mockfs.cc
+++ tests/sys/fs/fusefs/mockfs.cc
@@ -253,6 +253,10 @@
 				printf(" mtime=%" PRIu64 ".%u",
 					in.body.setattr.mtime,
 					in.body.setattr.mtimensec);
+			if (in.body.setattr.valid & FATTR_CRTIME)
+				printf(" crtime=%" PRIu64 ".%u",
+					in.body.setattr.crtime,
+					in.body.setattr.crtimensec);
 			if (in.body.setattr.valid & FATTR_FH)
 				printf(" fh=%" PRIu64 "", in.body.setattr.fh);
 			break;
Index: tests/sys/fs/fusefs/setattr.cc
===================================================================
--- tests/sys/fs/fusefs/setattr.cc
+++ tests/sys/fs/fusefs/setattr.cc
@@ -565,13 +565,14 @@
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const uint64_t ino = 42;
-	const timespec oldtimes[2] = {
+	const timespec newtimes[2] = {
 		{.tv_sec = 1, .tv_nsec = 2},
 		{.tv_sec = 3, .tv_nsec = 4},
 	};
-	const timespec newtimes[2] = {
+	const timespec oldtimes[3] = {
 		{.tv_sec = 5, .tv_nsec = 6},
 		{.tv_sec = 7, .tv_nsec = 8},
+		{.tv_sec = 9, .tv_nsec = 10},
 	};
 
 	EXPECT_LOOKUP(1, RELPATH)
@@ -584,12 +585,15 @@
 		out.body.entry.attr.atimensec = oldtimes[0].tv_nsec;
 		out.body.entry.attr.mtime = oldtimes[1].tv_sec;
 		out.body.entry.attr.mtimensec = oldtimes[1].tv_nsec;
+		out.body.entry.attr.crtime = oldtimes[2].tv_sec;
+		out.body.entry.attr.crtimensec = oldtimes[2].tv_nsec;
 	})));
 
 	EXPECT_CALL(*m_mock, process(
 		ResultOf([=](auto in) {
 			/* In protocol 7.23, ctime will be changed too */
-			uint32_t valid = FATTR_ATIME | FATTR_MTIME;
+			uint32_t valid = FATTR_ATIME | FATTR_MTIME |
+				FATTR_CRTIME;
 			return (in.header.opcode == FUSE_SETATTR &&
 				in.header.nodeid == ino &&
 				in.body.setattr.valid == valid &&
@@ -598,6 +602,14 @@
 					newtimes[0].tv_nsec &&
 				in.body.setattr.mtime == newtimes[1].tv_sec &&
 				in.body.setattr.mtimensec ==
+					newtimes[1].tv_nsec &&
+				/* 
+				 * birthtime can't be set directly.  Instead,
+				 * it's set to the older of the old birthtime
+				 * and the new mtime
+				 */
+				in.body.setattr.crtime == newtimes[1].tv_sec &&
+				in.body.setattr.crtimensec ==
 					newtimes[1].tv_nsec);
 		}, Eq(true)),
 		_)
@@ -609,19 +621,28 @@
 		out.body.attr.attr.atimensec = newtimes[0].tv_nsec;
 		out.body.attr.attr.mtime = newtimes[1].tv_sec;
 		out.body.attr.attr.mtimensec = newtimes[1].tv_nsec;
+		out.body.attr.attr.crtime = newtimes[1].tv_sec;
+		out.body.attr.attr.crtimensec = newtimes[1].tv_nsec;
 	})));
+
+	//struct stat sb;
+	//EXPECT_EQ(0, stat(FULLPATH, &sb));
+	//printf("atime=%ld.%ld\t", sb.st_atim.tv_sec, sb.st_atim.tv_nsec);
+	//printf("mtime=%ld.%ld\t", sb.st_mtim.tv_sec, sb.st_mtim.tv_nsec);
+	//printf("birthtime=%ld.%ld\n", sb.st_birthtim.tv_sec, sb.st_birthtim.tv_nsec);
 	EXPECT_EQ(0, utimensat(AT_FDCWD, FULLPATH, &newtimes[0], 0))
 		<< strerror(errno);
 }
 
-/* Change a file mtime but not its atime */
+/* Change a file's mtime but not its atime */
 TEST_F(Setattr, utimensat_mtime_only) {
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const uint64_t ino = 42;
-	const timespec oldtimes[2] = {
+	const timespec oldtimes[3] = {
 		{.tv_sec = 1, .tv_nsec = 2},
 		{.tv_sec = 3, .tv_nsec = 4},
+		{.tv_sec = 1, .tv_nsec = 1},
 	};
 	const timespec newtimes[2] = {
 		{.tv_sec = 5, .tv_nsec = UTIME_OMIT},
@@ -638,6 +659,8 @@
 		out.body.entry.attr.atimensec = oldtimes[0].tv_nsec;
 		out.body.entry.attr.mtime = oldtimes[1].tv_sec;
 		out.body.entry.attr.mtimensec = oldtimes[1].tv_nsec;
+		out.body.entry.attr.crtime = oldtimes[2].tv_sec;
+		out.body.entry.attr.crtimensec = oldtimes[2].tv_nsec;
 	})));
 
 	EXPECT_CALL(*m_mock, process(
@@ -675,9 +698,10 @@
 	const char FULLPATH[] = "mountpoint/some_file.txt";
 	const char RELPATH[] = "some_file.txt";
 	const uint64_t ino = 42;
-	const timespec oldtimes[2] = {
+	const timespec oldtimes[3] = {
 		{.tv_sec = 1, .tv_nsec = 2},
 		{.tv_sec = 3, .tv_nsec = 4},
+		{.tv_sec = 5, .tv_nsec = 6},
 	};
 	const timespec newtimes[2] = {
 		{.tv_sec = 0, .tv_nsec = UTIME_NOW},
@@ -701,6 +725,8 @@
 		out.body.entry.attr.atimensec = oldtimes[0].tv_nsec;
 		out.body.entry.attr.mtime = oldtimes[1].tv_sec;
 		out.body.entry.attr.mtimensec = oldtimes[1].tv_nsec;
+		out.body.entry.attr.crtime = oldtimes[2].tv_sec;
+		out.body.entry.attr.crtimensec = oldtimes[2].tv_nsec;
 	})));
 
 	EXPECT_CALL(*m_mock, process(