For clarification - Do you need sub-frame resolution (time in less than 1 frame period), or is whole-frame resolution good enough? From the pdf you attached, it looks like you do need sub-frame resolution.
There is a feature called the Text Overlay that can be enabled under the saved file Settings menu, accessible from the Play screen. It shows the time at which a frame was recorded, relative to the time of trigger. However, it only has whole-frame resolution.