>>> tdelta_idx = pd.to_timedelta([1, 2, 3], unit='ns')
>>> tdelta_idx
TimedeltaIndex(['0 days 00:00:00.000000001', '0 days 00:00:00.000000002',
'0 days 00:00:00.000000003'],
dtype='timedelta64[ns]', freq=None)
>>> tdelta_idx.nanoseconds
Index([1, 2, 3], dtype='int64')