Gitlab API milestones group

hey, im new using gitlab api, i need to know, how to get all milestone group without search by single project ?
in documentation only get milestone in single project
ex : https://gitlab.example.com/api/v4/projects/mobile%2FMyProject/milestones.

i need something like this
https://gitlab.example.com/api/v4/groups/mobile/milestones
and result is milestone group, where creating from here https://docs.gitlab.com/ce/user/project/milestones/index.html