code: def walk(self, topdown=True, followlinks=True):
          
          return self.connection.walk(self, topdown=topdown, followlinks=followlinks)
docs: walk: walk the filesystem (just like os.walk).
          Use like:
  
          path = URI('/some/dir')
          for root, dirs, files in path.walk():
              do_something()
  
          root will be an URI object.