This is a real use case I'm working with that needs nanosecond precision
and lead me in submitting this request:

most OSes let users capture network packets (using tools like tcpdump or
wireshark) and store them using file formats like pcap or pcap-ng. These
formats include a timestamp for each of the captured packets, and this
timestamp usually has nanosecond precision. The reason is that on
gigabit and 10 gigabit networks the frame rate is so high that
microsecond precision is not enough to tell two frames apart.
pcap (and now pcap-ng) are extremely popular file formats, with millions
of files stored around the world. Support for nanoseconds in datetime
would make it possible to properly parse these files inside python to
compute precise statistics, for example network delays or round trip times.

Other case is in stock markets. In that field information is timed in
nanoseconds and have the ability to easily deal with this kind of
representation natively with datetime can make the standard module even
more powerful.

The company I work for is in the data networking field, and we use
python extensively. Currently we rely on custom code to process
timestamps, a nanosecond datetime would let us avoit that and use
standard python datetime module.

Best Regards,

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Vincenzo Ampolo
http://vincenzo-ampolo.net
http://goshawknest.wordpress.com