* src/stat.c: Drop statbuf argument from out_epoch_sec().
Use statx() rather than [lf]stat() where available,
so a separate call is not required to get birth time.
Set STATX_* mask bits only for things we want to print,
which can be more efficient on some file systems.
Add a new --cache= command-line option that sets the appropriate hint
flags in the statx call. These are primarily used with network
file systems to indicate what level of cache coherency is desired.
The new option is available unconditionally for better portability,
and ignored where not implemented.
* doc/coreutils.texi: Add documention for --cached.
* man/stat.x (SEE ALSO): Mention statx().
* NEWS: Mention the new feature.
* man/stat.x (SEE ALSO): Mention statfs(2) in addition to stat(2).
Note statfs() is generally used rather than statvfs(),
so we'll defer that reference to the SEE ALSO section of statfs(2).
Fixes https://bugs.gnu.org/28989
Jeff Layton