title: What is a minimal valid UNC path?
body: <p>I want to make a library that (among other things) parses UNC paths, but I don't fully understand the grammar.</p>
  
  <p>Common example is: <code>\\server\share\path</code></p>
  
  <p>Are all of those required for a valid file path? I can navigate to <code>\\server</code> (without <code>share</code>) using Windows Explorer, but I assume it is using some share discovery protocol, not something filesystem APIs understand — is this right?</p>