Creates a bookmark of the given snapshot.
- Creates a new bookmark of the given snapshot or bookmark. Bookmarks mark
the point in time when the snapshot was created, and can be used as the
incremental source for a zfs-send(8) command.
When creating a bookmark from an existing redaction bookmark, the resulting
bookmark is not a redaction bookmark.
This feature must be enabled to be used. See
zpool-features(5) for details on ZFS feature
flags and the bookmarks feature.