title: How to determine a volume supports resolving bookmarks to renamed or moved files?
body: <p><code>- bookmarkDataWithOptions:includingResourceValuesForKeys:relativeToURL:error:</code></p>
  
  <p>Documentation states:</p>
  
  <blockquote>
    <p>This method returns bookmark data that can later be
    resolved into a URL object for a file even if the user moves or
    renames it (if the volume format on which the file resides supports
    doing so).</p>
  </blockquote>
  
  <p><strong>My question is, how can I query if a volume supports this feature?</strong></p>
  
  <p>From trial and error it seems only (internal?) hard drives support it, but I am looking for some kind of sure test like a <code>NSURLVolumeSupports???Key</code>. </p>
  
  <p><code>NSURLVolumeSupportsPersistentIDsKey</code> looks like a good candidate, but I failed to find any docs or google-info about it. Any hints?</p>