title: is there a Windows API to unmount a mount point
body: <p>I am writing a virtual file system using dokan.lib.
  This lib do not have unmountPoint function, it has unmountDrive.</p>
  
  <p>Either I am looking for a dokan lib which will support unmountpoint call
  or windows API which will remove this mounted point while leaving the app.</p>
  
  <p>Best</p>