MNTOPT_PCFS_FOLDCASE
static char *nofoldcase_cancel[] = { MNTOPT_PCFS_FOLDCASE, NULL };
{ MNTOPT_PCFS_FOLDCASE, foldcase_cancel, NULL, 0, NULL },
if (vfs_optionisset(vfsp, MNTOPT_PCFS_FOLDCASE, NULL))