(1) In any case in which an obligor is under court order to pay alimony or support and maintenance or child support in an action or judgment for divorce under this chapter or in an action or judgment for separate support under chapter two hundred and nine, the court which entered the support order shall retain continuing jurisdiction over the parties to the order and may enter an order of trustee process against the disposable earnings of the obligor, both those presently due and owing and those which will be due and owing at a future time, up to an amount permitted by federal law. Before the court may enter such an order, it shall find that all other domestic remedies available to collect support have been exhausted or would be ineffective. For the purpose of this section, the words "disposable earnings" shall mean that part of the compensation paid or payable to the obligor for personal services, whether denominated as wages, salary, commission, bonus, or otherwise, including periodic payments pursuant to a pension or retirement program, which remains after the deduction of any amounts required by law to be withheld; and the word "trustee" shall mean the person, firm, association, or corporation by whom the obligor is employed.