title: Multi-tenancy in react-admin
body: <p>Does <code>react-admin</code> support multi-tenancy, i.e. is it possible for <code>react-admin</code> to show a logged-in user only their own data?</p>
  <p>For example...</p>
  <ul>
  <li>Alice may have her own posts under <code>users/Alice/posts</code>, and</li>
  <li>Bob (perhaps from another organization) may have his own posts under <code>users/Bob/posts</code>.</li>
  </ul>
  <p>After Alice logs in, she can only access her own posts (all resources under <code>users/Alice/posts</code>). This feature <a href="https://marmelab.com/react-admin/Authorization.html" rel="nofollow noreferrer">https://marmelab.com/react-admin/Authorization.html</a> seems to only allow role-based access control <strong>within the same organization</strong>, which is very different from users (from different organizations) having their own data.</p>