test__parse_nsec_time
pass &= test__parse_nsec_time("0", 0);
pass &= test__parse_nsec_time("1", 1000000000ULL);
pass &= test__parse_nsec_time("0.000000001", 1);
pass &= test__parse_nsec_time("1.000000001", 1000000001ULL);
pass &= test__parse_nsec_time("123456.123456", 123456123456000ULL);
pass &= test__parse_nsec_time("1234567.123456789", 1234567123456789ULL);
pass &= test__parse_nsec_time("18446744073.709551615",