feat: set default mount permissions for SMB to 0775

[m-anyac]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Improve security for default mount permissions of directory and file to 0775
Fix default mount options for examples and document
Fix install document

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

feat: set default mount permissions for SMB to 0775

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: m-anyac
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• ✅ login: m-anyac (cbfe853)

[k8s-ci-robot]

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