unixMountIsSystemInternal
Checks if a Unix mount is a system mount. This is the Boolean OR of g_unix_is_system_fs_type(), g_unix_is_system_device_path() and g_unix_is_mount_path_system_internal() on @mount_entry’s properties.
The definition of what a ‘system’ mount entry is may change over time as new file system types and device paths are ignored.
Return
true if the unix mount is for a system path.
Parameters
mountEntry
a #GUnixMount.