Function compute_diff_with_options 

pub fn compute_diff_with_options(
    root: &Path,
    manifest: &Manifest,
    options: &WalkOptions,
) -> Result<DiffResult>

Compare the filesystem at root against the manifest with explicit walk filters. Excluded files are treated like deleted manifest entries so stale cached chunks are pruned from the index.

Errors

Returns an error if the root directory cannot be read.