Matter of M, 9 I. & N. Dec. 118, 119 (BIA 1960) (noncitizen not barred from establishing GMC under INA 101(f)(6) when s/he makes a voluntary and timely retraction of attempted false testimony); cf. Matter of Namio, 14 I. & N. Dec. 412, 414 (BIA 1973) (recantation of false testimony about one year later when disclosure of its falsity was imminent was neither a voluntary recantation nor a timely retraction and thus did not remove the bar to showing GMC under INA 101(f)(6)).