Django：按用户角色过滤用户

I am using the django admin site for my web app, but i am having a problem. I need that the staff users can change, create and delete another staff users, but i don't want that they change the informations of the superusers. I want to know if is possible filter the user list by role (the staff user don't see the superusers in the list).I am using the django admin site for my web app