code: function findAncestorDistance(src, target, currentDistance) {
    if (target === src) {
      return currentDistance;
    }
  
    const distances = [];
    src.getParents().forEach((srcParentChunkGroup) => {
      const distance = findAncestorDistance(
        srcParentChunkGroup,
        target,
        currentDistance + 1
      );
      if (distance >= 0) {
        distances.push(distance);
      }
    });
    if (distances.length === 0) {
      return -1;
    }
    return Math.min(...distances);
  }
docs: Find an ancestor of a chunk. Return the distance from the target or -1 if not found.
  
  @param {string} src
  @param {string} target
  @param {number} currentDistance
  @return {number} distance from target of parent or -1 when not found