Function probed 

pub fn probed<'a>(
    bench: &Bench,
    probing: &Probing<'_>,
    commits: &'a [String],
) -> Result<HashMap<&'a str, Snapshot>, Box<dyn Error>>

A snapshot for every one of these commits.

Asked of the store first and of a checkout second. On a line somebody has already looked at, this lays out no worktrees at all — which is the whole reason a walk of ten commits is affordable.