Hide child package for dokka documentation

Question

im want make doc just for main package so i have package with name com.exam.device, but doc from dokka also generate for child package ex: com.exam.device.utils, com.exam.device.utils.breakdown, com.exam.device.list. i need expose doc for main package only, i try this config but doesnt give what i wanted

dokkaHtml.configure {
    dokkaSourceSets {
        perPackageOption {
            matchingRegex.set("utils")
            suppress.set(true)
        }
    }
}