Trace should Ignore Options method and specific paths

[Talento90]

First of all thanks for this amazing project. I am using tracing to stackdriver and I would like to know How can I ignore http OPTION method and also some specific paths like /swagger or /.

For your info I am using ochttp to instrument my http server.

	return &http.Server{
		Handler:      &ochttp.Handler{Handler: router },
	}

[Talento90]

It seems that using GetStartOptions it ignores the OPTIONS method but not the "/" path :(

Handler: &ochttp.Handler{
	Handler: router,
	GetStartOptions: func(r *http.Request) trace.StartOptions {
		if r.Method == http.MethodOptions || r.URL.Path == "/" {
			return trace.StartOptions{
				Sampler:  trace.NeverSample(),
				SpanKind: trace.SpanKindServer,
			}
		}

		return trace.StartOptions{
			Sampler:  trace.AlwaysSample(),
			SpanKind: trace.SpanKindServer,
		}
	},
},