local.automount.fat.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>AbandonProcessGroup</key>
        <true/>
        <key>Label</key>
        <string>local.automount.fat</string>
        <key>StandardOutPath</key>
        <string>/tmp/local.automount.fat.outlog</string>
        <key>StandardErrorPath</key>
        <string>/tmp/local.automount.fat.errorlog</string>
        <key>ProgramArguments</key>
        <array>
            <string>/usr/local/bin/sshfs</string>
            <string>-o</string>
            <string>allow_other</string>
            <string>-o</string>
            <string>defer_permissions</string>
            <string>-F</string>
            <string>/Users/zhenyus/.ssh/config</string>
            <string>fat:/data/zhenyus</string>
            <string>/mnt/fat</string>
        </array>
        <key>RunAtLoad</key>
        <true/>
    </dict>
</plist>

local.automount.login.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>AbandonProcessGroup</key>
        <true/>
        <key>Label</key>
        <string>local.automount.login</string>
        <key>StandardOutPath</key>
        <string>/tmp/local.automount.login.outlog</string>
        <key>StandardErrorPath</key>
        <string>/tmp/local.automount.login.errorlog</string>
        <key>ProgramArguments</key>
        <array>
            <string>/usr/local/bin/sshfs</string>
            <string>-o</string>
            <string>allow_other</string>
            <string>-o</string>
            <string>defer_permissions</string>
            <string>-F</string>
            <string>/Users/zhenyus/.ssh/config</string>
            <string>login:/home/zhenyus</string>
            <string>/mnt/login</string>
        </array>
        <key>RunAtLoad</key>
        <true/>
    </dict>
</plist>

Put under /Library/LaunchDaemons/.
To rerun the code:

sudo launchctl unload /Library/LaunchDaemons/local.automount.login.plist
sudo launchctl load /Library/LaunchDaemons/local.automount.login.plist