[BUG] ubuntu文件系统/可用量显示存在bug

[yangxinpei2015]

Is there an existing issue for this?

• [X] I have searched the existing issues

Current Behavior

在ubuntu服务器监控详情里面，文件系统/可用量显示存在bug，可能是因为挂载了docker相关的内容，导致文件名称比较长。

Expected Behavior

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Steps To Reproduce

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Environment

HertzBeat version(1.15):

Debug logs

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Anything else?

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