The zfs get command does not work with the bookmark parameter while it works
properly with both filesystem and snapshot:
# zfs get -t all -r creation rpool/test
NAME               PROPERTY  VALUE                  SOURCE
rpool/test         creation  Fri Sep 16 15:00 2016  -
rpool/test@snap    creation  Fri Sep 16 15:00 2016  -
rpool/test#bkmark  creation  Fri Sep 16 15:00 2016  -
# zfs get -t all -r creation rpool/test@snap
NAME             PROPERTY  VALUE                  SOURCE
rpool/test@snap  creation  Fri Sep 16 15:00 2016  -
# zfs get -t all -r creation rpool/test#bkmark
cannot open 'rpool/test#bkmark': invalid dataset name
#
The zfs get command should be modified to work properly with bookmarks too.