title: "Unwind" from ANY view controller back to the storyboard's initial view controller
body: <p>Pre-conditions (Swift):</p>
  
  <ol>
  <li>I have an app with many view controllers on a single storyboard.</li>
  <li>There is a navigation controller, but the first few view controllers are not in it.  (I point this out b/c I can't just "pop to root" here.)</li>
  <li>There is a "session expire" event that triggers after x minutes.</li>
  </ol>
  
  <p>Use case:</p>
  
  <p>Regardless of which screen the user is on, if I see the "session expired" notification, I want to send the user back to my storyboard's initial view controller.</p>
  
  <p>My question:</p>
  
  <p>How exactly can I accomplish that without manually creating an unwind segue on every single view controller?  Is there some way to "throw away" the current instance of the storyboard and start over at the beginning?</p>
  
  <p>(I'm not worried about remembering their current state and what not...it doesn't matter for this scenario.  It expired, they lose, they start over.)</p>