Hi there! I would love to see option/condition to show fields/metabox or not if a post is parent or child of a custom post type (with pages and hierarchical capabilities!). I hope you’ll consider this 🙂
This is available with for pages (Page Type). It’s not available for custom post types but it is possible to create your own location rules http://www.advancedcustomfields.com/resources/custom-location-rules/. I think it’s reasons like this that the feature exists.
I will flag this topic for review by the developer.
Any news about this functionality in core? Or examples on how to do?
I don’t think you’ll be seeing a parent post or child post location rule any time in the near future built into ACF, especially for custom post types, and even more so of the parents/children are not the same post type. You’re going to need custom location rules https://www.advancedcustomfields.com/resources/custom-location-rules/.
I have also created several examples of custom location rules in this repo https://github.com/Hube2/acf-filters-and-functions. I don’t have one specifically for post parent, but there are a couple there that could be easily modified to be specific to the post parent.