title: Boot2Docker: Can't create directory: Protocol Error
body: <p>Trying to learn Docker in a windows machine. When I was trying create a new directory inside the shared User folder (/c/Users) by executing <code>sudo mkdir sample</code> but getting an error saying <code>Can't create directory 'sample': Protocol Error</code>.</p>
  
  <p>Any pointers to resolve this issue would be helpful.</p>