zfs list -t snapshot
zfs destroy tank/home/ahrens@now
[root@freenas ~]# zpool status pool: Drive state: ONLINE scan: none requested config: NAME STATE READ WRITE CKS UM Drive ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 gptid/1890e82e-1626-11e3-917d-bc5ff4b6cc71 ONLINE 0 0 0 gptid/1936c3f6-1626-11e3-917d-bc5ff4b6cc71 ONLINE 0 0 0 errors: No known data errors