code: func roundUpSize(volumeSizeBytes int64, allocationUnitBytes int64) int64 {
  	roundedUp := volumeSizeBytes / allocationUnitBytes
  	if volumeSizeBytes%allocationUnitBytes > 0 {
  		roundedUp++
  	}
  	return roundedUp
  }
docs: // roundUpSize calculates how many allocation units are needed to accommodate
  // a volume of given size. E.g. when user wants 1500MiB volume, while AWS EBS
  // allocates volumes in gibibyte-sized chunks,
  // RoundUpSize(1500 * 1024*1024, 1024*1024*1024) returns '2'
  // (2 GiB is the smallest allocatable volume that can hold 1500MiB)