Feature Request: Adding possibility to filter by "Allowed child node types" field

[PeterKvayt]

It would be great if there is will be possibility to filter by "Allowed child node types".

Here is my problem: we can see what DocTypes we can create under DocType, but there is no possibility to find all DocTypes which can be parent for particular DocType.

For instance I have DocType A, B, C. I can create C under B or A, so we can see it in "Permissions" -> "Allowed child node types" property in DocType settings for B or A. But I can't seeunder whom be created C from one place. To figure out this I need to see settings of all DocTypes.

Thanks.