zfs list -t filesystem -o space
Check USEDSNAP
zfs list -r -t snapshot freenas-boot
zfs destroy "freenas-boot/ROOT/snaphot@date-and-time"
zfs list -t filesystem -o space
Check USEDSNAP
zfs list -r -t snapshot freenas-boot
zfs destroy "freenas-boot/ROOT/snaphot@date-and-time"