Your tax returns cannot be garnished without you first being notified by the IRS, in which case, the bankruptcy documents would have been very useful from the get go. However, your parents filed bankruptcy, NOT YOU. You are the one who received an education, not your parents.
Contact the IRS, not the College. Explain to the IRS the situation and then resolve it. If you do owe for your education, then pay up and stop whining about it, you are not entitled to a free education no more than I am.