PTP_SAFE_TIME_OFFSET_NS
if (!cfg->start.tv_sec && cfg->start.tv_nsec < PTP_SAFE_TIME_OFFSET_NS)
cfg->start.tv_nsec += PTP_SAFE_TIME_OFFSET_NS;
if (ns > TIME64_MAX - PTP_SAFE_TIME_OFFSET_NS)
if (target_ns < ns + PTP_SAFE_TIME_OFFSET_NS) {