stat collects mount info even when it is not needed for the given output format #9072
Description
In the Stater struct of stat.rs, mount_list always gets populated if show_fs is false. However, the only function using the resulting list, find_mount_point, is only used for the m format specifier. The reading of mount point information in other contexts breaks assumptions made by security tools like AppArmor, with example breakage being reported at https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/2127851 regarding an invocation of stat -c '0%#a' "$CONFIG_FILE" in wg-quick, with the mount point reading being blocked by an AppArmor profile for wg-quick and resulting in spurious warnings.
The logic around populating mount_list should be reworked so that it only attempts to gather that information if required by the format string for the information being outputted.