code: func removeEmptyEntries(entries []*MigrateInfoEntry) []*MigrateInfoEntry {
  	nz := make([]*MigrateInfoEntry, 0, len(entries))
  	for _, e := range entries {
  		if e.TotalAbove > 0 {
  			nz = append(nz, e)
  		}
  	}
  
  	return nz
  }
docs: // removeEmptyEntries removes `*MigrateInfoEntry`'s for which no matching file
  // is above the given threshold "--above".