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I suggest that publishing nanoseconds as a plain int would be a nasty API. Consider what it would do to os.utime:
 if isinstance(mtime, int):
 # must be st_mtime_ns, it's in nanoseconds, use as-is
 value = mtime
 else:
 assert isinstance(mtime, float)
 # must be st_mtime, it's in seconds, multiply by a billion
 value = mtime * 1000000000
Have we ever published an API that treated a parameter as two wildly different numbers based solely on whether the parameter was an int or a float?