tracer.go
func (t StartTime) Apply(o *StartSpanOptions) {
	o.StartTime = time.Time(t)
}
func (t StartTime) Apply(o *StartSpanOptions) {
	o.StartTime = time.Time(t)
}
func ( t StartTime ) Apply ( o * StartSpanOptions ) { o . StartTime = time . Time ( t ) }
// Apply satisfies the StartSpanOption interface.
Apply satisfies the StartSpanOption interface .