Ok, sorry … how about this:

When post is updated, caches are deleted for that specific page … in my case WooCommerce product … that’s correct

But this product is “type simple”. WooCommerce has another type called “grouped” which links another post (product) under it self = parent product can has child products.

The problem is, that if you update child, parent is not updated and therefore page shows old content.

Example:
– I have product called “Chili”
– Then I have products (children) Chili 150g, Chili 500g
– When I update stock option of Chili 150g, single product on page /product/chili-150g/ is correctly updated (cache deleted).
– BUT the parent /product/chili/ is not …

And that is what I need. Update (delete cache of) parent product page in WooCommerce.