> (namespaced user with subuid - e.g. uid 100000), that can be deleted as the superior user (e.g. uid 1000) I'm afraid I don't know what this means. That when

> (namespaced user with subuid - e.g. uid 100000), that can be deleted as the superior user (e.g. uid 1000) I'm afraid I don't know what this means. That when you delete uid 1000, uid 100000 also gets deleted? Or, only user 1000 has permission to delete user 100000 ?