Can other people on my WiFi network access the documents on the hard drive attached to my AirPort Extreme?

If I was to attach a hard drive to my AirPort Extreme, would anyone connected to my WiFi be able to access the documents I store on there? Or must I give guests permission to access these documents? Furthermore, can I assign a password for accessing the hard drive (separate to one for joining the WiFi network)?

Thanks

AirPort Extreme

AirPort Extreme

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