FM / parameters

/sys/module/overlay/parameters

Name	Size	Mode	Actions
check_copy_up	4096	0644	edit dl rm
index	4096	0644	edit dl rm
metacopy	4096	0644	edit dl rm
nfs_export	4096	0644	edit dl rm
redirect_always_follow	4096	0644	edit dl rm
redirect_dir	4096	0644	edit dl rm
redirect_max	4096	0644	edit dl rm
xino_auto	4096	0644	edit dl rm

Edit: /sys/module/overlay/parameters/nfs_export (4096B)