Controls whether the access time for files is updated on read. This property is only valid for
filesystems. POSIX standards require that the access time for a file properly reflect the last time
it was read. This requires issuing writes to the underlying filesystem even for a mostly read only
workload. For working sets consisting primarily of reads over a large number of files, turning off
this property may yield performance improvements at the expense of standards conformance. These
updates happen asynchronously and are grouped together, so its effect should not be visible except
under heavy load.