Allows you to specify administrators who have access to groups and contacts within those groups.
Contacts will only be able to see groups for which they are administrators and the contacts in those groups.
Screenshot (click to enlarge)
Releases
Since CiviCRM 5.x, extension releases compatible with CiviCRM 5.0 are compatible with 5.0 and later. An extension release compatible with 5.25, for example, means that it requires CiviCRM 5.25 or later.