Elizabeth Wagmeister Senior CorrespondentAs Britney Spears’ court battle continues, her lawyer is asking the judge to prohibit her father, Jamie Spears, from accessing files from a private investigator that was hired by the pop star’s legal team to help probe into his management of his daughter’s 13-year conservatorship, which he largely oversaw.Spears’ father has requested records from Kroll, the P.I. firm brought on by the singer’s attorneys.