Confusing warning message when attempting to modify a directory without sufficient permissions

```
~ ❯❯❯ find bin
bin
bin/test.c
~ ❯❯❯ tar cf test.tar bin
~ ❯❯❯ tar xf test.tar -C /
bin/: Can't restore time
bin/test.c: Can't create 'bin/test.c'
tar: Error exit delayed from previous errors.
```

It would be better if `bin/: Can't restore time` said why it failed (in this case: presumably EPERM or EROFS). "Can't restore time" by itself is rather cryptic.