You can post a share-your-knowledge style question and answer. Say, the question would look like:

How can I find out what's blocking my access to a particular PATH?

With some back story and a preface and all. And then post your script in your answer, with a good explanation on how it works and its usage.

At which point, I'll post another answer pointing to namei:

$ namei -movx /var/spool/cron/crontabs/foo
f: /var/spool/cron/crontabs/foo
Drwxr-xr-x root root    /
drwxr-xr-x root root    var
drwxr-xr-x root root    spool
drwxr-xr-x root root    cron
drwx-wx--T root crontab crontabs
foo - No such file or directory

It doesn't list what's mounted on a mountpoint, but everything else is covered, I think.

You can post a share-your-knowledge style question and answer. Say, the question would look like:

How can I find out what's blocking my access to a particular path?

With some back story and a preface and all. And then post your script in your answer, with a good explanation on how it works and its usage.

At which point, I'll post another answer pointing to namei:

$ namei -movx /var/spool/cron/crontabs/foo
f: /var/spool/cron/crontabs/foo
Drwxr-xr-x root root    /
drwxr-xr-x root root    var
drwxr-xr-x root root    spool
drwxr-xr-x root root    cron
drwx-wx--T root crontab crontabs
foo - No such file or directory

It doesn't list what's mounted on a mountpoint, but everything else is covered, I think.

In general, while short enough script can be handled and improved in an answer, one should also post the script where others can easily contribute - such as on Github (as a gist or not), or Gitlab, Bitbucket, etc.