Avoid whiteout lookup on lower

I am trying to mount a s3 bucked as the lower to overlayfs.

Unfortunately, after mounting with fuse-overlayfs, mount-s3 report 1000s of .wh.XXX lookup and is completely overwhelmed. Is there a way to avoid this?

``` bash
mount-s3 --read-only --cache /tmp/s3-cache my-bucket -f -d ~/mnt_s3/my-bucket_lower

fuse-overlayfs -o lowerdir=~/mnt_s3/my-bucket_lower,upperdir=~/mnt_s3/my-bucket_upper,workdir=~/mnt_s3/my-bucket_working ~/mnt_s3/my-bucket
```

This works with `sudo mount -t overlay overlay..`, but I want a fuse option.

Reproduce the issue with the mount-s3 and fuse-overlayfs commands shown, then trace how lowerdir whiteout lookups are handled. Done means identifying a supported fuse option or behavior that prevents the reported .wh.XXX lookup flood while preserving overlay functionality.

Written by the indexing model from the issue text.