NextCloud , set quota

NethServer release 7.3.1611 (Final)
Nextcloud 12.x

Hello to all,
with nextcloud if user A has to share with user B, C, and D 100 GB of data, should the quota be set to 100 GB only to user A or to other users (B, C and D)?

Thank you

Only to user A.

From Nextcloud manuals:

Only files that originate with users count against their quotas, and not files shared with them that originate from other users. For example, if you upload files to a different user’s share, those files count against your quota. If you re-share a file that another user shared with you, that file does not count against your quota, but the originating user’s.