The mksnap_ffs utility creates a snapshot named snapshot_name on the file system mounted at mountpoint. The snapshot_name argument must be contained within the file system mounted at mountpoint.
The group ownership of the file is set to "operator"; the owner of the file remains "root". The mode of the snapshot is set to be readable by the owner or members of the "operator" group.
chmod(2), chown(8), mount(8)