root@thinkpad:/mnt# zfs list -t all
NAME             USED  AVAIL  REFER  MOUNTPOINT
rpool            201K  97.9G    31K  /mnt/rpool
rpool/root        62K  97.9G    32K  /mnt
rpool/root/var    30K  97.9G    30K  /mnt/var
root@thinkpad:/mnt# zfs snapshot -r rpool/root@testsnap1
root@thinkpad:/mnt# cd var/.zfs/snapshot/testsnap1/
root@thinkpad:/mnt/var/.zfs/snapshot/testsnap1# cd -
/mnt
root@thinkpad:/mnt# zfs destroy -v -r rpool/root@testsnap1
will destroy rpool/root@testsnap1
will destroy rpool/root/var@testsnap1
will reclaim 0
root@thinkpad:/mnt# zfs list -t all
NAME                       USED  AVAIL  REFER  MOUNTPOINT
rpool                      207K  97.9G    31K  /mnt/rpool
rpool/root                  62K  97.9G    32K  /mnt
rpool/root/var              30K  97.9G    30K  /mnt/var
rpool/root/var@testsnap1      0      -    30K  -
root@thinkpad:/mnt# zfs destroy -v -r rpool/root@testsnap1
will destroy rpool/root/var@testsnap1
will reclaim 0