Function add_default_groups 

pub fn add_default_groups(
    vec_groups: &mut Vec<Group>,
    vec_computers: &[Computer],
    domain: String,
) -> Result<(), Box<dyn Error>>

Function to add default groups https://github.com/fox-it/BloodHound.py/blob/645082e3462c93f31b571db945cde1fd7b837fb9/bloodhound/enumeration/memberships.py#L411