var initRequiredNFS = func(f flag.NStringFlag, fn func(nfs *vcfg.NFSSettings, s string)) error {
    return initFromNStringFlag(f, func(i int, s string) {
        for len(overrideVCFG.NFS) < i+1 {
            overrideVCFG.NFS = append(overrideVCFG.NFS, vcfg.NFSSettings{})
        }