How to remove access to folders with the same name?

Question

htaccess

There are folders named "not_visible" in different directories.
RewriteEngine on
RewriteCond %{REMOTE_ADDR} !^21\.14\.13\.70 my ip
RewriteRule ^not_visible/ [R=301,L] <- What is the rule to hide them from all IPs except mine?

Answer 1

<FilesMatch "/var/www/site.ru/not_visible$">
Allow from 21.14.13.70
</Files>

something like this? just correct the syntax there