These are some notes, and links on my research for verifying a network packet capture workflow, and determining if that was supporting nanosecond timestamps.

My conclusion is that while Sub-Second resolution is certainly possible in network packet capture analysis; and a nanosecond is equal to 1000 picoseconds or 1/1000 of a microsecond, and it should be remembered that this does not guarantee that your source packets are stamped with this accuracy!

This article examines the requirements for this accuracy, and why properly understanding this can lead to more accurate assessments of network performance of applications, whether nanosecond packet captures are taken or not. I caution that assumptions about packet accuracy may cause erroneous conclusions on collected data.