Help me understand this diet instructions pls

Instructions says:

- 7 days before procedure: Stop fiber supplements.

- 3 days before procedure: Stop eating any raw fruits, raw vegetables, vegetables containing seeds, popcorn, nuts, and seeds.

Questions:

1. Is wheat bran considered a fiber supplement? Should I stop eating it 3 days or 7 days before the procedure?

2. Should I stop eating oatmeal (cooked rolled oats) 3 days or 7 days before the procedure?

3. Based on the instructions, I am assuming 3 days before the procedure it’s okay to eat cooked vegetables that have no seeds like carrots, celery, mushrooms?