title: Delete folder with contents from Firebase Storage
body: <p>I can easily delete a file within a child reference, but how would I delete the entire folder from Firebase Storage?</p>
  
  <pre><code>let postRef = FIRStorage.storage().reference().child("posts/folderName")
      postRef.deleteWithCompletion { (error) in
          print(error)
      }
  </code></pre>
  
  <p>Error file does not exists. Any ideas?</p>