Function index_with_gc_filtered 

pub async fn index_with_gc_filtered(
    root: &Path,
    src: &Path,
    repo: &str,
    view: &str,
    gc_after: bool,
    filter: &IndexFilter,
) -> Result<(IndexSummary, Option<GcSummary>)>

index_with_gc, with control over which paths enter the view (#209).