MC_NANOSECOND_MASK
start_ns = timeset->host_start & MC_NANOSECOND_MASK;
end_ns = timeset->host_end & MC_NANOSECOND_MASK;
(ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK);
(ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK);
start_ns = timeset->host_start & MC_NANOSECOND_MASK;
end_ns = timeset->host_end & MC_NANOSECOND_MASK;