Previously (with fusefs-exfat):
# touch mount_fuse/HELLOWORLD.txt
# umount mount_fuse

Also previously: https://reviews.freebsd.org/P457 

# for f in mount_native/* ; do echo "$f" ; done
msdosfs_root(); mp 0xfffffe001a3c5ac0, pmp 0xfffff80035047d80
deget(pmp 0xfffff80035047d80, dirclust 0, diroffset 1fffffff, depp 0xfffffe001bb2a688)
msdosfs_readdir(): vp 0xfffff80003ff9b70, uio 0xfffffe001bb2a9d0, cred 0xfffff80003fc8e00, eofflagp 0xfffffe001bb2a9cc
msdosfs_readdir(): vp 0xfffff80003ff9b70, uio 0xfffffe001bb2a9d0, cred 0xfffff80003fc8e00, eofflagp 0xfffffe001bb2a9cc
msdosfs_inactive(): dep 0xfffff8003502de00, de_Name[0] 0
msdosfs_inactive(): v_usecount 0, de_Name[0] 0
msdosfs_reclaim(): dep 0xfffff8003502de00, file , refcnt 1

mount_native/HELLOWORLD.txt