Ggrep: how to run in the context of containing git repo folder

[nimaai]

I am working in a context of a git repo ("parent") cointaining another git repo as submodule ("child"). I do :Ggrep --recurse-submodules foo from within parent to include the matches in the child as well. Now I would like to have the same behaviour when grepping from the context of a child's file, meaning including the matches from the parent. How to do that? It seems that the context switches to the child repo depending of the file loaded in the buffer from which Ggrep is executed. Thanks.