improved UNC path handling, thanks to Julien Bouquillon

fs/osfs/__init__.py

@@ -108,7 +108,11 @@ class OSFS(OSFSXAttrMixin, OSFSWatchMixin, FS):
                 if not root_path.startswith("\\"):
                    root_path = u"\\\\?\\" + root_path
                 else:
-                   root_path = u"\\\\?" + root_path
+                   # Explicitly mark UNC paths, seems to work better.
+                   if root_path.startswith("\\\\"):
+                       root_path = u"\\\\?\\UNC\\" + root_path[2:]
+                   else:
+                       root_path = u"\\\\?" + root_path 
             #  If it points at the root of a drive, it needs a trailing slash.
             if len(root_path) == 6 and not root_path.endswith("\\"):
                 root_path = root_path + "\\"