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Date: Sun, 18 Jan 2015 11:39:59 +0100
From: Edward Tomasz =?utf-8?Q?Napiera=C5=82a?= <trasz@FreeBSD.org>
To: arch@FreeBSD.org
Subject: Access times on directories.
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What is FreeBSD semantics for atime updates on directories?  It does not
seem to be working.  Is that by design?

The reason I'm asking is because it would allow autounmountd(8) to actually
unmount filesystems some specified time after last use, by checking atime
of filesystem's root, instead of just retrying unmount(2) until it succeeds.