cpdup(1), a DragonFly copying tool that really should be more used, now uses microseconds for comparison.  This is probably related to the sysctl vfs.timestamp_precision also now using microseconds.

This probably won’t affect your usage of cpdup unless you are copying some very actively modified files, but I like to mention it in case someone feels like porting it to OpenBSD/NetBSD – it’s already in FreeBSD, though I assume it’s a slightly older version.