title: Django Admin: Show different models to different users
body: <p>I have two superusers (<code>user1</code> and <code>user2</code>) and two models (<code>ModelA</code> and <code>ModelB</code>). In the admin page, I want to show just <code>ModelA</code> to <code>user1</code>, so <code>user1</code> can only edit <code>ModelA</code> instances but not <code>ModelB</code> instances. Similarly, I want to have <code>user2</code> able to edit <code>ModelB</code> instances only. Is there a way to achieve this?</p>