What is the difference between bintime() and nanotime() (FreeBSD)?

Question

FreeBSD

Can anyone explain what is the difference between nanotime(9) and bintime(9) if the return value of bintime(struct bintime) can be converted (bintime2timespec) to nanotime(timespec)? Thanks for the answer.

Answer 1

bin result in struct bintime containing seconds and 64-bit fractions of seconds.
nano result in struct timespec containing seconds and nanoseconds
So it looks like it can be converted, but with loss of precision.