title: Docker does not free up space on clean operations
body: <p>I have a lot of space (partition full) in the /var/lib/docker/aufs folder.</p>
  
  <p>I've cleaned my volumes with :</p>
  
  <pre><code>docker volume rm $(docker volume ls -qf dangling=true)
  </code></pre>
  
  <p>Cleaned images with :</p>
  
  <pre><code>docker rmi $(docker images --filter "dangling=true" -q --no-trunc)
  </code></pre>
  
  <p>But no effect on the <code>/var/lib/docker/aufs</code> folder.</p>
  
  <p>Any ideas? 
  Thanks</p>