code: def getatime(self, path):
          
          try:
              file_obj = self.filesystem.resolve(path)
          except IOError:
              self.filesystem.raise_os_error(errno.ENOENT)
          return file_obj.st_atime
docs: Returns the last access time of the fake file.
  
          Note: Access time is not set automatically in fake filesystem
              on access.
  
          Args:
              path: the path to fake file.
  
          Returns:
              (int, float) the access time of the fake file in number of seconds
                  since the epoch.
  
          Raises:
              OSError: if the file does not exist.