The first method is: StockLocation.is_sublocation_of()
This method is currently used in:
* wms/stock_dynamic_routing
* wms/shopfloor
* wms/stock_move_source_relocate
* stock-logistics-warehouse/stock_reserve_rule
* ddmrp/ddmrp
The goal will be to use this module as dependency instead of
reimplementing the method in each.
Other methods should follow in "stock_helper".
Note: I opened https://github.com/odoo/odoo/pull/53866 to propose a
generic version of this method, expecting odoo's opinion, but got no
answer.