docs: def calculate_perf_100nsec_timer(previous, current, property_name):
      """
      PERF_100NSEC_TIMER
  
      https://technet.microsoft.com/en-us/library/cc728274(v=ws.10).aspx
      """
      n0 = previous[property_name]
      n1 = current[property_name]
      d0 = previous["Timestamp_Sys100NS"]
      d1 = current["Timestamp_Sys100NS"]
  
      if n0 is None or n1 is None:
          return
  
      return (n1 - n0) / (d1 - d0) * 100