Britney Spears estranged husband Sam Asghari will still feature in her upcoming memoir after their shock split but only fleetingly, MailOnline can exclusively reveal. Difficult: Britney Spears estranged husband Sam Asghari will still feature in her upcoming memoir after their shock split but only fleetingly, MailOnline can exclusively reveal Tough: The Toxic hitmaker, is divorcing Iranian-American model Asghari, 29, after …