code: def join_parsed_parts(self, drv, root, parts, drv2, root2, parts2):
          
          if root2:
              if not drv2 and drv:
                  return drv, root2, [drv + root2] + parts2[1:]
          elif drv2:
              if drv2 == drv or self.casefold(drv2) == self.casefold(drv):
                  # Same drive => second path is relative to the first
                  return drv, root, parts + parts2[1:]
          else:
              # Second path is non-anchored (common case)
              return drv, root, parts + parts2
          return drv2, root2, parts2
docs: Join the two paths represented by the respective
          (drive, root, parts) tuples.  Return a new (drive, root, parts) tuple.