time.nano is a timer that provides high precision but possibly low accuracy. Such a timer is typically useful for timing the duration of events, such as measuring the time it takes to perform some calculation.
time.nano may have a signficant drift compared to actual time, it might not be the right source of time to, e.g., feed an alarm clock that should wake you up at 6h30 every morning.
time.nano is a timer that provides high precision but possibly low
accuracy. Such a timer is typically useful for timing the duration
of events, such as measuring the time it takes to perform some
calculation.
time.nano may have a signficant drift compared to actual time, it might
not be the right source of time to, e.g., feed an alarm clock that should
wake you up at 6h30 every morning.