InfluxDB Flux - only show values over a certain %

Question

I am using InfluxDb with Grafana and I am only wanting it to show values over a certain %. Any ideas how I could do this.

  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)
  |> filter(fn: (r) => r["_measurement"] == "vsphere_datastore_disk")
  |> filter(fn: (r) => r["_field"] == "capacity_latest" or r["_field"] == "used_latest")
  |> filter(fn: (r) => r["source"] =~ /.*/)
  |> pivot(rowKey:["_time"], columnKey: ["_field"], valueColumn: "_value")
  |> map(fn: (r) => ({ r with  _value: float(v: r.used_latest) / float(v: r.capacity_latest) * 100.0 }))
  |> group(columns: ["source","_field"])
  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)
  |> yield(name: "mean") ```