code: func Import(s *Snapshot) *Histogram {
  	h := New(s.LowestTrackableValue, s.HighestTrackableValue, int(s.SignificantFigures))
  	h.counts = s.Counts
  	totalCount := int64(0)
  	for i := int32(0); i < h.countsLen; i++ {
  		countAtIndex := h.counts[i]
  		if countAtIndex > 0 {
  			totalCount += countAtIndex
  		}
  	}
  	h.totalCount = totalCount
  	return h
  }
docs: // Import returns a new Histogram populated from the Snapshot data (which the
  // caller must stop accessing).