Pagination support for Management groups API

With reference to :https://docs.microsoft.com/en-us/rest/api/resources/managementgroups/get

API: GET https://management.azure.com/providers/Microsoft.Management/managementGroups/{groupId}?api-version=2018-03-01-preview&$expand=children&$recurse={$recurse}&$filter={$filter}

Question: In a tenant with 1000s of accounts, this can return a nested response which is very huge. The docs don't talk about pagination.Are the results returned at once or is there a pagination available for this but not documented?