PS C:\path\to\vagrant> vagrant up --provider=hyperv
Bringing machine 'default' up with 'hyperv' provider...
==> default: Verifying Hyper-V is enabled...
==> default: Verifying Hyper-V is accessible...
==> default: Importing a Hyper-V instance
    default: Creating and registering the VM...
    default: Successfully imported VM
    default: Please choose a switch to attach to your Hyper-V instance.
    default: If none of these are appropriate, please open the Hyper-V manager
    default: to create a new virtual switch.
    default:
    default: 1) Default Switch
    default: 2) WSL
    default:
    default: What switch would you like to use? 1
    default: Configuring the VM...
==> default: Starting the machine...
==> default: Waiting for the machine to report its IP address...
    default: Timeout: 120 seconds
    default: IP: 172.17.213.194
==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address: 172.17.213.194:22
    default: SSH username: vagrant
    default: SSH auth method: private key
    default:
    default: Vagrant insecure key detected. Vagrant will automatically replace
    default: this with a newly generated keypair for better security.
    default:
    default: Inserting generated public key within guest...
    default: Removing insecure key from the guest if it's present...
    default: Key inserted! Disconnecting and reconnecting using new SSH key...
==> default: Machine booted and ready!
==> default: Preparing SMB shared folders...
    default: You will be asked for the username and password to use for the SMB
    default: folders shortly. Please use the proper username/password of your
    default: account.
    default:
    default: Username:
    default: Password (will be hidden):

Vagrant requires administrator access to create SMB shares and
may request access to complete setup of configured shares.
==> default: Mounting SMB shared folders...
    default: C:/path/to/vagrant => /vagrant
Failed to mount folders in Linux guest. This is usually because
the "vboxsf" file system is not available. Please verify that
the guest additions are properly installed in the guest and
can work properly. The command attempted was:

mount -t cifs -o vers=2.0,credentials=/etc/smb_creds_vgt-1eef7ca9fead584de4f08022a0b48ea2-6ad5fdbcbf2eaa93bd62f92333a2e6e5,uid=1000,gid=1000 //172.17.213.193/vgt-1eef7ca9fead584de4f08022a0b48ea2-6ad5fdbcbf2eaa93bd62f92333a2e6e5 /vagrant

The error output from the last command was:

mount error(13): Permission denied
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)