Expiration date limits for reshare of a received share

Example: (today is 2020-02-25)

1. There is no default expiration date set (i.e. default is "never expire")

2. Anne shares folder with Bob and sets expiration date 2020-03-03

3. Bob shares with Carol and sets expiration date to 2020-03-10 (or clears the expiration date)
   After 2020-03-03 Bob cannot see the folder, but Carol can see it. That seems odd, since Anne originally only gave Bob access until 2020-03-03, so why can Bob grant Carol longer access.

4. There is default expiration date set to e.g. 7 days (but not enforced)

5. Anne shares folder with Bob and expiration date defaults to 2020-03-03

6. Bob shares with Carol and sets expiration date to 2020-03-10 (or clears the expiration date)
   After 2020-03-03 Bob cannot see the folder, but Carol can see it. That seems odd, since Anne originally only gave Bob access until 2020-03-03, so why can Bob grant Carol longer access.

7. There is default expiration date set to e.g. 7 days and enforced

8. Anne shares folder with Bob and sets expiration date to 2020-02-28 (earlier than the enforced maximum)

9. Bob shares with Carol and sets expiration date to 2020-03-03 (the enforced maximum)
   After 2020-02-28 Bob cannot see the folder, but Carol can see it. That seems odd, since Anne originally only gave Bob access until 2020-02-28, so why can Bob grant Carol longer access.

IMO when I receive a share that has an expiration date set, and has reshare permission, then I should have to keep and expiration date when I reshare it, and the expiration date of the reshare should be <= the expiration date of the received share. (i.e. I should not be able to grant longer access than the access that I received)

@pmaier1 or... what is the required behaviour?

No files, tests, or entry points are identified in the issue. Read the 16-comment discussion first to establish the required behavior, then locate the share-expiration and reshare-permission code and its tests; done means coverage confirms a reshare cannot outlive the received share.