code: def remove_all_servers(self):
          
          # 'no ntp' removes all server entries.
          # For command_builder, disable command 'ntp' gives the desired command
          cmd = self.command_builder('ntp', disable=True)
          return self.configure(cmd)
docs: Remove all NTP server entries from the node config
  
          Returns:
              True if the operation succeeds, otherwise False.