The accuracy of timestamps?

I am eager to ask what is the maximum accuracy of timestamps supported by Timescale in an IOT scenario.Thank you very much!

The default timestamp format is in microsecond accuracy.

If you need nanosecond accuracy, you can use big integers as timestamps.

Thank you for your answer!!
I was wondering how to set the timestamp to ns in timescaleDB as you mentioned?
I don’t seem to see the method in the timescaleDB document.