case "Marker":
			z.Marker, bts, err = msgp.ReadStringBytes(bts)
			if err != nil {
				err = msgp.WrapError(err, "Marker")
				return
			}
		case "LatestOnly":
			z.LatestOnly, bts, err = msgp.ReadBoolBytes(bts)
			if err != nil {
				err = msgp.WrapError(err, "LatestOnly")
				return
			}
		case "AskDisks":
			z.AskDisks, bts, err = msgp.ReadStringBytes(bts)
			if err != nil {

type WalkOptions struct {
	Filter       func(info FileInfo) bool // return WalkFilter returns 'true/false'
	Marker       string                   // set to skip until this object
	LatestOnly   bool                     // returns only latest versions for all matching objects
	AskDisks     string                   // dictates how many disks are being listed

		}
		for _, prefix := range prefixes {
			prefixResultCh := make(chan itemOrErr[ObjectInfo], workerSize)
			err := api.Walk(ctx, r.Bucket, prefix, prefixResultCh, WalkOptions{
				Marker:       lastObject,
				LatestOnly:   false, // we need to visit all versions of the object to implement purge: retainVersions
				VersionsSort: WalkVersionsSortDesc,
			})
			if err != nil {
				cancelCause(err)
				xioutil.SafeClose(results)

						disks[i], disks[j] = disks[j], disks[i]
					})
					fallbackDisks = disks[askDisks:]
					disks = disks[:askDisks]
				}

				requestedVersions := 0
				if opts.LatestOnly {
					requestedVersions = 1
				}

				// However many we ask, versions must exist on ~50%
				listingQuorum := (askDisks + 1) / 2

				// How to resolve partial results.