code: func WithNoopTracer(tracerNoop bool) TracerOption {
  	return func(o *Tracer) error {
  		if tracerNoop {
  			o.noop = 1
  		} else {
  			o.noop = 0
  		}
  		return nil
  	}
  }
docs: // WithNoopTracer allows one to start the Tracer as Noop implementation.