Use the runtime.Caller() function!

timeTrack.go

func timeTrack(start time.Time) {                                                 
        elapsed := time.Since(start)                                              
        fname := ""                                                               
        pc, _, _, ok := runtime.Caller(1);                                        
        if ok {                                                                   
                fname = runtime.FuncForPC(pc).Name()                              
        }                                                                         
        fmt.Printf("Function %s took %v\n", fname, elapsed);                      
}