code: func DefaultClientOptions() []option.ClientOption {
  	return []option.ClientOption{
  		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
  			grpc.MaxCallRecvMsgSize(1024*1024*16),
  			grpc.MaxCallSendMsgSize(1024*1024*16),
  		)),
  	}
  }
docs: // DefaultCallOptions returns a function set of ClientOptions to apply to a
  // BigTable client.