code: func (d *DockerHelper) DoParallelListContainerBenchmark(interval, testPeriod time.Duration, routineNumber int, all bool) []int {
  	wg := &sync.WaitGroup{}
  	wg.Add(routineNumber)
  	latenciesTable := make([][]int, routineNumber)
  	for i := 0; i < routineNumber; i++ {
  		go func(index int) {
  			latenciesTable[index] = d.DoListContainerBenchmark(interval, testPeriod, all)
  			wg.Done()
  		}(i)
  	}
  	wg.Wait()
  	allLatencies := []int{}
  	for _, latencies := range latenciesTable {
  		allLatencies = append(allLatencies, latencies...)
  	}
  	return allLatencies
  }
docs: // DoParallelListContainerBenchmark starts routineNumber of goroutines and let them do DoListContainerBenchmark,
  // returns latencies of all the calls in nanoseconds