Is your feature request related to a problem? Please describe.

• after Implement EC logic in PUT #3457, storage shards are sorted by EC part ID on PUT
• after Engine EC #3534, storage shards are sorted by EC part parent ID on GET

Describe the solution you'd like

since

• part ID is unavailable on GET
• parent ID is available on PUT

it'd be more efficient to sort shards by parent ID on PUT