Function libfuse_sys::helpers::fuse_ll_ops_on_readdir

pub unsafe extern "C" fn fuse_ll_ops_on_readdir(
    op: *mut fuse_lowlevel_ops, 
    readdir: Option<unsafe extern "C" fn(_: fuse_req_t, _: fuse_ino_t, _: size_t, _: off_t, _: *mut fuse_file_info)>
)