code: def readdir(self, req, ino, size, off, fi):
          
          if ino == 1:
              attr = {'st_ino': 1, 'st_mode': S_IFDIR}
              entries = [('.', attr), ('..', attr)]
              self.reply_readdir(req, size, off, entries)
          else:
              self.reply_err(req, errno.ENOENT)
docs: Read directory
  
          Valid replies:
              reply_readdir
              reply_err