relatime
Update inode access times relative to modify or change time. Access time is only
updated if the previous access time was earlier than the current modify or change
time. (Similar to noatime, but it doesn't break mutt or other applications that need
to know if a file has been read since the last time it was modified.)
Since Linux 2.6.30, the kernel defaults to the behavior provided by this option
(unless noatime was specified), and the strictatime option is required to obtain tra‐
ditional semantics. In addition, since Linux 2.6.30, the file's last access time is
always updated if it is more than 1 day old.
norelatime
Do not use the relatime feature. See also the strictatime mount option.