code: func NewGRPCLogger(l *zap.Logger) *zapgrpc.Logger {
  	l = l.WithOptions(
  		zap.AddCaller(),
  		zap.AddCallerSkip(3),
  	)
  	return zapgrpc.NewLogger(l, zapgrpc.WithDebug())
  }
docs: // NewGRPCLogger creates a grpc.Logger that delegates to a zap.Logger.