How much of a person's social security can be garnished for back alimony?

Social Security and Garnishment:
Generally, Social Security benefits are exempt from execution, levy, attachment, garnishment, or other legal process, or from the operation of any bankruptcy or insolvency law. The following benefits are exceptions and subject to garnishment:

(1) to the authority of the Secretary of the Treasury to make levies for the collection of delinquent Federal taxes and under certain circumstances delinquent child support payments; and

(2) to garnishment or similar legal process brought by an individual to enforce a child support or alimony obligation.

Section 207 of the Social Security Act provides: "The right of any person to any future payment under this title shall not be transferable or assignable, at law or in equity, and none of the moneys paid or payable or rights existing under this title shall be subject to execution, levy, attachment, garnishment, or other legal process, or to the operation of any bankruptcy or insolvency law."

Edit: so basically - whatever percent that the court decides.

For the amount ordered in the court order